<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Bootstrap 101 Template</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.css" rel="stylesheet">

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
    <style>
        body{
            padding-top:70px;
        }
    </style>
</head>
<body>
<nav class="navbar navbar-default navbar-fixed-top" role="navigation">
    <!-- navbar-fixed-top浮动在顶部 -->
    <div class="container">
        <!-- container-fluid brand在左边 -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-target="#bs-example-navbar-collapse-1">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">某管理系统</a>
        </div>
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">综述</a></li>
                <li><a href="#">简述</a></li>
                <li><a href="#">特点</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">特点<span class="caret"></span></a>
                    <ul class="dropdown-menu" role="menu">
                        <li><a href="#">Chrome</a></li>
                        <li><a href="#">Firefox</a></li>
                        <li><a href="#">Safari</a></li>
                        <li><a href="#">Opera</a></li>
                        <li class="divider"></li>
                        <li><a href="#">IE</a></li>
                    </ul>
                </li>
                <li><a href="#">关于</a></li>
            </ul>
        </div>
    </div>

</nav>

<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="js/jquery-2.1.4.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>